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ChartMatrix

Repository source: ChartMatrix

Description

This example illustrates the use vtkChartMatrix, a container that holds a matrix of charts. The example creates a 2 x 2 matrix of plots. The matrix elements are:

The example also illustrates how to use vtkNamedColors to set the colors for the plots.

Other languages

See (PythonicAPI)

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

ChartMatrix.cxx

#include <vtkAxis.h>
#include <vtkChartMatrix.h>
#include <vtkChartXY.h>
#include <vtkContextView.h>
#include <vtkFloatArray.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPlot.h>
#include <vtkPlotPoints.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkTable.h>
#include <vtkVersion.h>

#if VTK_VERSION_NUMBER >= 90220220630ULL
#define VTK_HAS_SETCOLORF 1
#endif

//----------------------------------------------------------------------------
int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  // Set up a 2D scene, add an XY chart to it.
  vtkNew<vtkContextView> view;
  view->GetRenderWindow()->SetSize(1280, 1024);
  view->GetRenderWindow()->SetWindowName("ChartMatrix");

  vtkNew<vtkChartMatrix> matrix;
  view->GetScene()->AddItem(matrix);
  matrix->SetSize(vtkVector2i(2, 2));
  matrix->SetGutter(vtkVector2f(30.0, 30.0));

  // Create a table with some points in it...
  vtkNew<vtkTable> table;
  vtkNew<vtkFloatArray> arrX;

  arrX->SetName("X Axis");
  table->AddColumn(arrX);

  vtkNew<vtkFloatArray> arrC;
  arrC->SetName("Cosine");
  table->AddColumn(arrC);

  vtkNew<vtkFloatArray> arrS;
  arrS->SetName("Sine");
  table->AddColumn(arrS);

  vtkNew<vtkFloatArray> arrS2;
  arrS2->SetName("Sine2");
  table->AddColumn(arrS2);

  vtkNew<vtkFloatArray> tangent;
  tangent->SetName("Tangent");
  table->AddColumn(tangent);

  int numPoints = 42;
  float inc = 7.5 / (numPoints - 1);
  table->SetNumberOfRows(numPoints);
  for (int i = 0; i < numPoints; ++i)
  {
    table->SetValue(i, 0, i * inc);
    table->SetValue(i, 1, cos(i * inc));
    table->SetValue(i, 2, sin(i * inc));
    table->SetValue(i, 3, sin(i * inc) + 0.5);
    table->SetValue(i, 4, tan(i * inc));
  }

  // Add multiple line plots, setting the colors etc
  // Lower left plot, a point chart.
  vtkChart* chart = matrix->GetChart(vtkVector2i(0, 0));
  vtkPlot* plot = chart->AddPlot(vtkChart::POINTS);
  plot->SetInputData(table, 0, 1);
  dynamic_cast<vtkPlotPoints*>(plot)->SetMarkerStyle(vtkPlotPoints::DIAMOND);
#if VTK_HAS_SETCOLORF
  plot->GetXAxis()->GetGridPen()->SetColorF(
      colors->GetColor3d("warm_grey").GetData());
  plot->GetYAxis()->GetGridPen()->SetColorF(
      colors->GetColor3d("warm_grey").GetData());
#else
  plot->GetXAxis()->GetGridPen()->SetColor(
      colors->GetColor3d("warm_grey").GetData());
  plot->GetYAxis()->GetGridPen()->SetColor(
      colors->GetColor3d("warm_grey").GetData());
#endif
  plot->SetColor(colors->GetColor3ub("sea_green").GetRed(),
                 colors->GetColor3ub("sea_green").GetGreen(),
                 colors->GetColor3ub("sea_green").GetBlue(), 255);

  // Upper left plot, a point chart.
  chart = matrix->GetChart(vtkVector2i(0, 1));
  plot = chart->AddPlot(vtkChart::POINTS);
  plot->SetInputData(table, 0, 2);
#if VTK_HAS_SETCOLORF
  plot->GetXAxis()->GetGridPen()->SetColorF(
      colors->GetColor3d("warm_grey").GetData());
  plot->GetYAxis()->GetGridPen()->SetColorF(
      colors->GetColor3d("warm_grey").GetData());
#else
  plot->GetXAxis()->GetGridPen()->SetColor(
      colors->GetColor3d("warm_grey").GetData());
  plot->GetYAxis()->GetGridPen()->SetColor(
      colors->GetColor3d("warm_grey").GetData());
#endif
  plot->SetColor(colors->GetColor3ub("rose_madder").GetRed(),
                 colors->GetColor3ub("rose_madder").GetGreen(),
                 colors->GetColor3ub("rose_madder").GetBlue(), 255);

  // Upper right plot, a bar and point chart.
  chart = matrix->GetChart(vtkVector2i(1, 1));
  plot = chart->AddPlot(vtkChart::BAR);
  plot->SetInputData(table, 0, 4);
#if VTK_HAS_SETCOLORF
  plot->GetXAxis()->GetGridPen()->SetColorF(
      colors->GetColor3d("warm_grey").GetData());
  plot->GetYAxis()->GetGridPen()->SetColorF(
      colors->GetColor3d("warm_grey").GetData());
#else
  plot->GetXAxis()->GetGridPen()->SetColor(
      colors->GetColor3d("warm_grey").GetData());
  plot->GetYAxis()->GetGridPen()->SetColor(
      colors->GetColor3d("warm_grey").GetData());
#endif
  plot->SetColor(colors->GetColor3ub("burnt_sienna").GetRed(),
                 colors->GetColor3ub("burnt_sienna").GetGreen(),
                 colors->GetColor3ub("burnt_sienna").GetBlue(), 255);

  plot = chart->AddPlot(vtkChart::POINTS);
  plot->SetInputData(table, 0, 3);
  dynamic_cast<vtkPlotPoints*>(plot)->SetMarkerStyle(vtkPlotPoints::CROSS);
#if VTK_HAS_SETCOLORF
  plot->GetXAxis()->GetGridPen()->SetColorF(
      colors->GetColor3d("warm_grey").GetData());
  plot->GetYAxis()->GetGridPen()->SetColorF(
      colors->GetColor3d("warm_grey").GetData());
#else
  plot->GetXAxis()->GetGridPen()->SetColor(
      colors->GetColor3d("warm_grey").GetData());
  plot->GetYAxis()->GetGridPen()->SetColor(
      colors->GetColor3d("warm_grey").GetData());
#endif
  plot->SetColor(colors->GetColor3ub("rose_madder").GetRed(),
                 colors->GetColor3ub("rose_madder").GetGreen(),
                 colors->GetColor3ub("rose_madder").GetBlue(), 255);

  // Lower right plot, two line charts.
  chart = matrix->GetChart(vtkVector2i(1, 0));
  plot = chart->AddPlot(vtkChart::LINE);
  plot->SetInputData(table, 0, 1);
#if VTK_HAS_SETCOLORF
  plot->GetXAxis()->GetGridPen()->SetColorF(
      colors->GetColor3d("warm_grey").GetData());
  plot->GetYAxis()->GetGridPen()->SetColorF(
      colors->GetColor3d("warm_grey").GetData());
#else
  plot->GetXAxis()->GetGridPen()->SetColor(
      colors->GetColor3d("warm_grey").GetData());
  plot->GetYAxis()->GetGridPen()->SetColor(
      colors->GetColor3d("warm_grey").GetData());
#endif
  plot->SetColor(colors->GetColor3ub("dark_orange").GetRed(),
                 colors->GetColor3ub("dark_orange").GetGreen(),
                 colors->GetColor3ub("dark_orange").GetBlue(), 255);

  plot = chart->AddPlot(vtkChart::LINE);
  plot->SetInputData(table, 0, 2);
#if VTK_HAS_SETCOLORF
  plot->GetXAxis()->GetGridPen()->SetColorF(
      colors->GetColor3d("warm_grey").GetData());
  plot->GetYAxis()->GetGridPen()->SetColorF(
      colors->GetColor3d("warm_grey").GetData());
#else
  plot->GetXAxis()->GetGridPen()->SetColor(
      colors->GetColor3d("warm_grey").GetData());
  plot->GetYAxis()->GetGridPen()->SetColor(
      colors->GetColor3d("warm_grey").GetData());
#endif
  plot->SetColor(colors->GetColor3ub("royal_blue").GetRed(),
                 colors->GetColor3ub("royal_blue").GetGreen(),
                 colors->GetColor3ub("royal_blue").GetBlue(), 255);

  // Finally render the scene and compare the image to a reference image
  view->GetRenderer()->SetBackground(
      colors->GetColor3d("navajo_white").GetData());
  view->GetRenderWindow()->Render();
  view->GetInteractor()->Initialize();
  view->GetInteractor()->Start();
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(ChartMatrix)

find_package(VTK COMPONENTS 
  ChartsCore
  CommonColor
  CommonCore
  CommonDataModel
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
  ViewsContext2D
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "ChartMatrix: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(ChartMatrix MACOSX_BUNDLE ChartMatrix.cxx )
  target_link_libraries(ChartMatrix PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS ChartMatrix
  MODULES ${VTK_LIBRARIES}
)

Download and Build ChartMatrix

Click here to download ChartMatrix and its CMakeLists.txt file. Once the tarball ChartMatrix.tar has been downloaded and extracted,

cd ChartMatrix/build

If VTK is installed:

cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

make

and run it:

./ChartMatrix

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.